在因果集群环境中使用 neo4j-import 的步骤示例
以下步骤描述了如何在因果集群环境中使用 neo4j-import，这些步骤是在单个 Linux 主机上运行的，其中安装了 3 个 Neo4j 3.1.2 副本，路径如下
~/HA/ha1/neo4j-enterprise-3.1.2 ~/HA/ha2/neo4j-enterprise-3.1.2 ~/HA/ha3/neo4j-enterprise-3.1.2
这类似于 设置本地因果集群 的说明
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验证了因果集群能够形成（在配置
$NEO4J_HOME/cond/neo4j.conf后）并运行了
~/HA/ha1/neo4j-enterprise-3.1.2/bin/neo4j start; ~/HA/ha2/neo4j-enterprise-3.1.2/bin/neo4j start;
~/HA/ha3/neo4j-enterprise-3.1.2/bin/neo4j start这假设默认数据库为 graph.db
由于启动因果集群需要进行大量配置，我想确保它至少能够启动，并且数据库是空的。
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通过运行以下命令停止了因果集群
~/HA/ha1/neo4j-enterprise-3.1.2/bin/neo4j stop; ~/HA/ha2/neo4j-enterprise-3.1.2/bin/neo4j stop;
~/HA/ha3/neo4j-enterprise-3.1.2/bin/neo4j stop其产生了以下输出
Stopping Neo4j..................................... stopped Stopping Neo4j.................................... stopped Stopping Neo4j..................................... stopped
$ ~/HA/ha2/neo4j-enterprise-3.1.2/bin/neo4j-admin unbind --database=graph.db
$ ~/HA/ha1/neo4j-enterprise-3.1.2/bin/neo4j-admin unbind --database=graph.db
$ ~/HA/ha3/neo4j-enterprise-3.1.2/bin/neo4j-admin unbind --database=graph.db~/HA/ha1/neo4j-enterprise-3.1.2/bin/neo4j-import --into ~/HA/ha1/neo4j-enterprise-3.1.2/data/databases/graph.db.importer --nodes ~/HA/ha1/neo4j-enterprise-3.1.2/importer/movies.csv --nodes ~/HA/ha1/neo4j-enterprise-3.1.2/importer/actors.csv --relationships ~/HA/ha1/neo4j-enterprise-3.1.2/importer/roles.csv这产生了以下输出
WARNING: neo4j-import is deprecated and support for it will be removed in a future version of Neo4j; please use neo4j-admin import instead. Neo4j version: 3.1.2 Importing the contents of these files into /home/neo4j/HA/ha1/neo4j-enterprise-3.1.2/data/databases/graph.db.importer: Nodes: /home/neo4j/HA/ha1/neo4j-enterprise-3.1.2/importer/movies.csv /home/neo4j/HA/ha1/neo4j-enterprise-3.1.2/importer/actors.csv Relationships: /home/neo4j/HA/ha1/neo4j-enterprise-3.1.2/importer/roles.csv Available resources: Free machine memory: 5.01 GB Max heap memory : 1.47 GB Processors: 1 Nodes Done in 100ms Prepare node index Done in 26ms Calculate dense nodes Done in 43ms Node --> Relationship Sparse Done in 10ms Relationship --> Relationship Sparse Done in 11ms Minority relationships Done in 32ms Count groups Done in 10ms Gather Done in 11ms Write Done in 10ms Node --> Group Done in 11ms Node counts Done in 53ms Relationship counts Done in 11ms IMPORT DONE in 1s 881ms. Imported: 6 nodes 0 relationships 15 properties Peak memory usage: 7.63 MB
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更新了 3 个
$NEO4J_HOME/conf/neo4j.conf文件中的每一个，并定义了
# The name of the database to mount
dbms.active_database=graph.db.importer因为这代表了从 neo4j-import 准备的数据库的名称。
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通过以下方式将 graph.db.importer 从实例 1 复制到实例 2 和 3
cp -R ~/HA/ha1/neo4j-enterprise-3.1.2/data/databases/graph.db.importer ~/HA/ha2/neo4j-enterprise-3.1.2/data/databases/graph.db.importer
cp -R ~/HA/ha1/neo4j-enterprise-3.1.2/data/databases/graph.db.importer ~/HA/ha3/neo4j-enterprise-3.1.2/data/databases/graph.db.importer-
按如下方式启动所有 3 个实例
~/HA/ha1/neo4j-enterprise-3.1.2/bin/neo4j start; ~/HA/ha2/neo4j-enterprise-3.1.2/bin/neo4j start;
~/HA/ha3/neo4j-enterprise-3.1.2/bin/neo4j start这产生了以下输出
Starting Neo4j. Started neo4j (pid 3976). It is available at http://0.0.0.0:7414/ There may be a short delay until the server is ready. See /home/neo4j/HA/ha1/neo4j-enterprise-3.1.2/logs/neo4j.log for current status. Starting Neo4j. Started neo4j (pid 4040). It is available at http://0.0.0.0:7424/ There may be a short delay until the server is ready. See /home/neo4j/HA/ha2/neo4j-enterprise-3.1.2/logs/neo4j.log for current status. Starting Neo4j. Started neo4j (pid 4104). It is available at http://0.0.0.0:7434/ There may be a short delay until the server is ready. See /home/neo4j/HA/ha3/neo4j-enterprise-3.1.2/logs/neo4j.log for current status.
在 3 个实例中的每一个上运行了 match (n) return n limit 10，并且所有实例都报告总共有 6 个节点，这与 neo4j-import 的输出相符，该输出报告
Imported: 6 nodes 0 relationships 15 properties
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我从主节点运行了
create (n:Tester {id:105});并验证了它在主节点和副本节点上均已创建。
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